Air-pump.



PATENTED NOV. 26, 1907. J. C. BECK & J. A. BOWYER.

AIR PUMP.

APPLICATION FILED r3345, 1907.

I S l Toall whom tt mayconcem:

NITED- STATES PATENT OFFICE."

JOHN G. BECK AND JOHN A. BOWYER, CHICAGO, ILLINOIS.

' AIR-PUMP.

Be it known that we, JOHN. C. BECK and JOHN A. .Bowrnacitizens of the United States, .and residents of Chicago, 'inthe county of'Cook and State of'Ilhnois, have invented certain new and useful Improvemerits in Air-Pumps, of which .thefollowing,

When taken'in connection withthe drawing accompanymg and formin a part hereof,.is a full and complete speci cation, "sufficient to enable those skilled inthe art to which it pertains to understand,, make, and use the same.

which. a given quantity or volume of air-can be uickly forced into a tire or other receptacle y 'a person using the device while such person. is working the pump at a moderate speed. And a 'i'urther object of theirivention is to obtaina pum of the character named which can be easi y. operated" as descrlbed by a erson of average strength.

. A further d b' tain a pump 0 the character named-whichcan be readily adjusted to'fill a tireor-other section of the alarm and adjustable air receptacle with air at a given pressure and W111 then cease to force additional air into such tire or other receptacle and will also give an alarm to attract'the attention of the operator.

A further object of the invention is to obtain a pump of the character describedwhich is economical in construction, sightly in ap pearance and not readily gotten out-ofre pair.

In the drawing referred to Figure 1' is an viewed in-the direction indicated by the arrows. Flg. 4 is a horizontal section on line 44 of Flg. 3, viewed in the direction indi cated by the arrows, and Fig. 5 is a vertical ressure controller -of the device, on an enar ed scale. reference letter applied to designate a given part is used to indicate such part 1 Specification of LettersPatent. Application filed Pebruai-y '25. 1907. sem No. 359.197.

ect' of the invention is to ob- Fi 3 isavvert1calsection on line 33 of Fig. 4,

Patented Nov. 26, 907.

throughout the several figures ofthe drawing,wherever the same appears.

inserted therein in the usual way. 1

O is thelarger one of the two air cylinders cylinders.

E is the I ated. F is th'episton rod of cylinder C and G is the. pistonr'od of cylinder'D.,-Piston rods'F and G are both secured in handle E.

" His the piston head in cylinderG secured and h is the ordinary'leatheror'packing on piston head H and is'so'placed that asgthe piston rod F is raised alr 'in'the cyhnder above the pistonhead is compressed above such piston head itIldjfOICQdiflOHl suchcylinder through passa eway 1 into the smaller ton rod G secured in placeby the nut-d."

9' is the ordinary leather or packing on pie-- ton head J arranged so that as-the piston rod G is moved downward the air in cylinder D below such pistonhead J is compressed and forcedthrough passage Kin part- B of the base-into chamber L. I

As is Well known in theart when the leather or packing (h, 9') of a piston head is arranged to force 'air ahead of it when the piston rod is moved in one direction, upon the movement ofthepiston rod in the op osite direction passage ways (M, m)- W' 1 be .formed between the. leather of the piston head and the cylindrical wall of the cylinder in whichit is placed, and through such passage ways airwill beforced by atmospheric pressure into -the chamber in the cylinder which is being enlarged byxsuch movement of the piston rod. Because eof such fact, when the handle E and piston rods F and G are raised from the positionof such piston rods in Fig. 3 the air in cylinders C and D above the piston heads H and J will be coml pressed and if such handle E and rods F and I G are raised until the piston heads H and J are substantially at the upper end of the cylinders C and D. all the airabove-such' piston heads will be forced below piston head J in cylinder D, and if, as We prefer, the cylinder when piston heads H and J are down, (say in the position thereof illustrated in Fig. 3) when such piston heads are at the upperend A, B is the base of the pump-,-preferably made so that the foot ofthe operator may be v handle by whichthepump iset of the pump and D is smaller one of such 7 to the lower end of piston rod F, as by nutf cylinder D, and Jls the piston head on pis;

G contains twice as much air as cylinder D,

of the cylinders the pressure of the air in cylinder D below'piston head J will approximate three atmospheres and as the piston head J is forced down such air under pressure of about three atmospheres will be forced, as hereinbefore stated, through passage way K in chamber L and from thence through flexible tube N into the receptacle designed to contain such air, at a pressure determined by mechanism forming a part of this pump and about to be described.

To prevent air in chamber L flowing back therefrom through passage Way K into the provide head 1 having ears Z, Z thereon with oles Z, I, through which the screw bolts Q, ,Q, extend with the screw threaded portion of such bolts engaging with like screw threads in part B of the base. The head I can in this manner be securedin lace so that no air will flow from chamber L between the upper end of the cylinderical walls thereof 7 and such head. I

To control the ressure in the receptacle into which air is f drced from chamber Lwe rovide a combined alarm and relief valve. his relief valve is shown in section in Fig. 5 of the drawing and comprises the tube R with screw threads 1* thereon, secured in head Z, bottom S in such tube, such bottom provided with passage way T, having valve seat t at .the upper end thereof, the valve U on stem '11,, such valve co-acting with the valve seat t, spring V yieldingly holdin valve U on seat t, and cap W provided with the partition to having passage ways n) thereon and with screw threads w en aging the corresponding screw threads on tube R. The ressure of the spring V on valve U is varled by the,

' whistle in then per end of ca By the use 0 the reliefvalye and signal when a pneumatic tire for a vehicle is to be inflated y the-use of this pump not only is over inflation of the tire impossible, and

full inflation obtainable, but, in addition thereto an alarm or signal-is givento the person operati the pump. p

Y is the et to cylinder C.

Having thusdescribed our invention what we claim is new and desire to secure by Letters Patent is 1. In an air pump, the combination-of a cylinder provided with a piston, a chamber,

a base'common to the cylinder and chamber, ,70

between the cylinders, a chamber, a base common to the cylinders and chamber, such base provided with a passage way communieating with one of the cylinders and with the chamber, means to prevent the flow of air through such passa e way from the chamber to the c linder, an such chamber provided with a dlscharge passage way, and adjustable mechanism to dlvert the discharge of air in the chamber from the discharge passa e way when a desired maximum pressure 0 air is flowing through such discharge passage way; substantially as described. I

3. Inan air ump, the combination of cylinders of equa length and different diameters, a communicating passage way between the cylinders adjacent to the upper end thereof, a chamber, a -communicating passage way between the small cylinder and the chamber, a valve seat at the discharge end of the passage way and a valve in the chamber to co-act with the valve seat, a spring in the chamber to yieldingly hold the valve on the seat, piston rods in the cylinders, a handle common to the piston rods, such piston rods respectively rovided with piston heads arranged so t at when the piston rods are raised the air above the piston heads in both 0 linders is forced below the piston head in t e smaller cylinder and when the piston rods are depressed theair below the piston head in the smaller cylinder is forced into the chamber and air at atmospheric pressure may enter both cylinders above the downward moving piston heads, an air discharge tube fromthe chamber and a combined 1'61. lief and signal device in communication with the chamber; substantially as described.

JOHN C. BECK.

Inthe presence of CHARLES TURNER JOHN A. BOWYER. 

